Carriage bolts are round bolts with a small, square neck section under the head. They have a unified thread pitch and are made from low or medium carbon steel or stainless steel. The square neck on a carriage bolt is designed to keep it from turning as a nut is tightened. Carriage bolts are most often used in outdoor furniture.
RC Fasteners & Components stocks a large inventory of Grade A, A307 unplated carriage bolts, RoHS-compliant zinc clear-coated carriage bolts, hot dip galvanized carriage bolts, Grade 5 carriage bolts, and stainless steel carriage bolts